# -*- coding: utf-8 -*-
from bs4 import BeautifulSoup
import re
import urlparse

class HtmlParser(object):
    def _get_new_urls(self,page_url,soup):
        new_urls = set()
        # /view/123.htm
        links = soup.find_all('a',href=re.compile(r'/view/\d+\.htm'))
        for link in links:
            new_url = link['href']
            new_full_url = urlparse.urljoin(page_url,new_url)
            new_urls.add(new_full_url)
        return new_full_url

    def _get_new_data(self,page_url,soup):
        res_data = dict()
        # url
        res_data['url'] = page_url
        # <dd class="lemmaWgt-lemmaTitle-title"><h1>Python</h1>
        title_node = soup.find('dd',class_='lemmaWgt-lemmaTitle-title').find('h1')
        res_data['title'] = title_node.get_text()
        # <div class="lemma-summary" label-module="lemmaSummary"><div class="para" label-module="para">Python是一种跨平台的<a 
        summary_node = soup.find('div',class_='lemma-summary')
        res_data['summary'] = summary_node.get_text()
        return res_data

    def parse(self,page_url,html_cont):
        if page_url is None or html_cont is None:
            return
        soup = BeautifulSoup(html_cont,'html.parser',from_encoding='utf-8')
        new_urls = self._get_new_urls(page_url,soup)
        new_data = self._get_new_data(page_url,soup)
        return new_urls,new_data


